'Day' in the Bible

“For the vision is yet for the appointed [future] timeIt hurries toward the goal [of fulfillment]; it will not fail.Even though it delays, wait [patiently] for it,Because it will certainly come; it will not delay.

I heard and my whole inner self trembled;My lips quivered at the sound.Decay and rottenness enter my bones,And I tremble in my place.Because I must wait quietly for the day of distress,For the people to arise who will invade and attack us.